Piston skirt stabilizer



Feb. 23, 1954 M. w. MARIEN 2,670,254

PISTONV sKRT STABILIZER Filed Sept. 30, 1950 IIIIIIIIIIA ,o 34 zz z3INVENTOR.

ATTORNEY.

MELLVIN W. MARIEN Patented Feb. 23, 1954 PISTON SKIRT STABILIZER MelvinW. Marien, Richmond Heights, Mo., as-

signor to Ramsey Corporation, St. Louis, Mo., a corporation of DelawareApplication September 30, 1950, Serial No. 187,790

8 Claims.

My invention has relation to improvements in piston skirt stabilizers(sometimes -called piston skirt expanders) and it consists in the novelfeatures of construction more fully set forth in the specication andpointed out in the claims.

Piston skirt stabilizers (or expanders) have generally been usedheretofore for the rehabilitation of worn engines in order to overcomeexcessive clearance between the piston and the cylinder due to wear. Thepresent invention is concerned more particularly with stabilizers to beinitially inserted in the pistons so as to prevent any ycollapse of thepiston skirt and compensate for wear between the piston and cylinder asit occurs. mounted within the piston skirt so as not to become displacedduring the operation thereof and at the same time should be of aconstruction that will permit easy and quick application.

These advantages, together with others inherent in the invention, willbe better -apparent from a detailed description of the invention inconnection with the accompanying drawings, in which:

Fig. 1 is a combined side elevation and middle longitudinal section of atypical piston showing my improved stabilizer mounted therein; Fig. 2 isa bottom plan of the lpiston showing the stabilizer in place; Fig. 3 isa vertical longitudinal section taken on a plane indicated by the line3--3 in Fig. l; Fig. 4 is a cross-sectional detail through my improvedstabilizer taken on the line 4--4 in Fig. 1; Fig. 5 is a fragmentaryview of the piston skirt showing one of the bosses between which thestabilizer is mounted; Fig. 6 is a section similar to that shown in Fig.4, but of a modified form of construction; Fig. 7 is a side elevation ofthe modification shown in Fig. 6 contracted prior to insertion Withinthe piston skirt; Fig. 8 is a cross section of a further modied form ofthe invention; Fig. 9 is a side elevation of the modification shown inFig. 8; and Fig. 10 is a still further modified form of the inventionshown in longitudinal section.

Referring to the drawings, P represents a niston connected to aconnecting rod R, (dotted in Figs. 1 to 3 inclusive) by a Wrist pin W.There are a pair of my improved stabilizers (or expanders) E, E insertedwithin the piston skirt S for the purpose of exerting pressure thereonin a di rection at right angles to the axis of the wrist pin. This isthe direction of the thrust during the operation of the lpiston and ifthe latter is to collapse it will do so in this plane. The use of astabilizer (or expander) to prevent piston collapse is not new. However,the stabilizer form- `Obviously the stabilizer must be securely 4 ingthe subject of the present invention is to my knowledge novel both inits general construction and in the manner of its application to thepiston. 'Since each stabilizer E of the pair is identical, only one willbe described.

It will be noted that there are two pairs of bosses I, I disposed inopposing relation within the piston skirt S and spaced suiiciently so:that when the expanders E, E are mounted between opposing bosses theywill straddle the connecting rod R (Fig. 3).

Each of the bosses I, I is provided with a socket 2, in which socketvthe expander E is mounted in the following manner: The expander Ecomprises a tube 3 provided with threads 4 at one end of which is passedan adjusting nut 5. Disposed within the threaded end of the tube 3 is acylindrical plug 5 terminating in a flange l from which extends a pin 8.The pin 8 is lodged in one of the sockets 2. A second plug 9 is disposedin the opposite end of the tube 3, said plug also having a ange I0 and apin II which fits in socket 2. There is a coiled spring I2 disposed overthe tube 3 and conned between flange I0 and adjusting nut 5 so as toexert tension expansively against the plug 6 and plug 9. By adjustingthe position of the nut '5 the tension on spring I2 may be varied eitherto exert greater pressure on the piston skirt or lesser pressure as therequirements demand.

`It is apparent from the foregoing that consid-y to the necessary degreethereafter.

In Figs. 6 and 7 I show a somewhat modied form of invention in whichthree Cylinders I5, It, and Il are arranged in telescopic relation, theterminal cylinders IS and I'I having openings I8 and I9 formed in theirextremities so as to receive the bosses 2li and '2l within the pistonskirt S'. The inner margins of the cylinders I6 and i? are swaged overas indicated at 22 and '23 so that they may be held together by hooks 24to overcome the tension of spring 25 prior to the insertion of expandersin the piston skirt lS. Of course, after the expanders have beeninserted in position the hooks 2t may be snipped so as to permit thespring 25 to expand the cylinders I6 and I'I against opposite surfacesof the skirt S.

In Fig. 8 I show a modification wherein two identical cylinders 25, 26,having their inner ends closed and their outer ends open to receivebosses 21, 2'! formed in the piston skirt S, are connected by a nut 28.Obviously the cylinders 26, 26 are provided with right and left handthreads and the nut is similarly threaded so as to operate as aturnbuckle. In the modincation shown in Fig. lthere are but twocylinders 30, 3| telescopically arranged, the outer cylinder Si! havingslots 32, 32 formed in it. The purpose of the slots is to permit pins33, 33 fixed in cylinder 3| to project upwardly for cooperation withlugs 34, 34 formed on cylinder 30, wherebythe cylinders may becontracted to permit of easyuinsertion within the piston skirt S".' I

It should be readily apparent that the invention is readily susceptibleof many modifications, and I do not wish to be restricted to any of thespecic forms herein shown.

Having described my invention, I claim:

l. A piston stabilizer comprising a pair ci tubular housings.' a thirdtubular member in tele scopic relation therewith, al Vcoiled springdisposed within the'assembled housings and suitable forn'iations oninner extremities ci said pair of housings to receive, a tool wherebysaid housings may be contracted over the pressure ci said spring.

2.,A A piston stabilizer comprising telescopically arranged tubularmembers, a coiled spring disposed within said tubular members and toolreceiving elements projecting from the periphery of said members wherebythey may be compressed over the tension of said springs.

3. A self-contained piston stabilizer comprising a capsule havingextensible and contractible end portions, end faces on `said endportions shaped and sized for engagement with piston retainers to holdthe capsule in spanning relation across the skirt of a piston, springmeans in said capsule urging said end portions out- Wardly for causingsaid end faces to `exert an expanding force on the piston skirt,peripheral protuberances on the end portions, and means coacting withsaid protuberances for retaining the end portions in assembled capsuleforming relation` 4. A piston stabilizer to be mounted within andtransversely cf the skirt of the piston to expand the piston skirtcomprising teleseopingly arranged members with end portions arranged iranged members and retained so arranged by i means forming part oftheend portions of said members and end portions of said coil spring.

contacting only said last mentioned means.

5. A piston stabilizer to be mounted within and transversely of theskirt of the piston to expand said skirt comprising telescopinglyarranged members with outer end portions arranged and `disposed toassociate and cooperate with stabilizer retaining portions on saidpiston skirt, a coil spring concentrically and telescopingly arrangedwithin said telescopingly arranged members and retained and sopositioned by means forming part of the said outer end portions of themembers, the ends of said coil spring contacting only said lastmentioned means, and tool receiving means on the periphery of said amembers whereby they may be compressed over the tension of said spring.

6. A piston stabilizer to be mounted within and transversely of theskirt of the piston to expand the said skirt comprising a pair oftelescopingly arranged members with swedged-in outer end portionsarranged and disposed to associate and cooperate with stabilizerretaining portions on said piston skirts, a coil spring concentricallyand telescopingly arranged within said pair of telescopingly arrangedmembers and retained and so positioned by said swedged-in outer endportion of said members, the ends of said coil spring contacting onlysaid sWedged-in outer end portion, and tool receiving elementsprojecting from the periphery of said members whereby they may becompressed over the tension of said spring.

'7.v A piston stabilizer to be mounted within and transversely of theskirt of the piston to expand the said skirt comprising a pair oftelescopingly arranged members with swedged-in outer end portionsarranged and disposed to associate and cooperate with stabilizerretaining portions on said piston skirt, a third member telescopinglyarranged and disposed Within said pair of members, said pair of membersand said third member forming a housing containing a coil springooncentrically and telescopinglyarranged therewithin and retained sopositioned by said swedged-in end portions of said pair of members, theends of said coil springs contacting only said swedged-in end portionsand suit'- able formations on the inner extremities of said housing toreceive a tool whereby said housing may be contracted over the pressureof said spring.

8. A piston stabilizer to be mounted within and transversely of theskirt of the piston to expand the said skirt comprising a pair oftelescopingly arranged members with swedged-in outer` end portionsarranged and disposed to associateV and cooperate with stabilizerretaining portionson said piston skirts, a third member telescopinglyarranged within said pair of members, said pair of members on saidthirdmember forming a housing including therewithin a coil spring con,`centrically and telescopingly associated 'therewith, said coil springretained so associated and positioned by said swedgedfin outer endportions of said pair of members, the ends of said coil springcontacting only said swedged-inouter end portions, said pair of membershaving swedgedout inner extremities receiving hooks retaining the partsof the housing and stabilizer in 4proper association and in capsule formagainst the tension of the spring.

MELVIN W. MARIEN.

References Cited in the file of this patent UNITED STATES PATENTS .GreatBritain Mar.` 26, 1925 1... a sin

